@ -911,7 +911,7 @@ More about Port Knocking technique:
- [Improved Port Knocking with Strong Authentication - Rennie deGraaf, John Aycock, and Michael Jacobson, Jr.∗ (Department of Computer Science - University of Calgary)](https://www.acsac.org/2005/papers/156.pdf)
- [Improved Port Knocking with Strong Authentication - Rennie deGraaf, John Aycock, and Michael Jacobson, Jr.∗ (Department of Computer Science - University of Calgary)](https://www.acsac.org/2005/papers/156.pdf)
- [portknocking.org](http://www.portknocking.org/) and practical solutions on [Implementations sub-page](http://www.portknocking.org/view/implementations)
- [portknocking.org](http://www.portknocking.org/) and practical solutions on [Implementations sub-page](http://www.portknocking.org/view/implementations)